(build) Fix failing build

Recently, including the default value for UseInProcessClient in the
cake.config file has been causing a build error.  Rather than dig into
what is going on, let's remove the inclusion of the default value, and
let it execute without it.

Author: gep13

cake.config

@@ -3,7 +3,6 @@
 
 [Nuget]
 Source=https://api.nuget.org/v3/index.json
-UseInProcessClient=true
 
 [Paths]
 Tools=./tools